Dual-band Air-Ground Radio Performance: Example Flight Test Results

We recently concluded a four-year University Leadership Initiative (ULI) project sponsored by NASA, which investigated multiple aviation communications technology areas aimed at enhancing future aviation safety. These areas were dual-band air-ground communications for air traffic management, detection and interdiction of small drones, and high-capacity terrestrial airport communications networking. In this paper we report on flight test results of our dual-band radios. These radios were designed to use a spectrally efficient multi-carrier modulation, filterbank multicarrier (FBMC), which we had previously shown to improve resilience to high-power distance measurement equipment (DME) adjacent-channel interference, in comparison to existing orthogonal frequency division multiplexing (OFDM) schemes. In our NASA project, we designed the FBMC radios to extend performance even further, using the following techniques: (i) simultaneous dual-band transmission and reception;(ii) ground station (GS) spatial diversity;(iii) higher-order modulation for a factor of 5 capacity increase over QPSK;(iv) a Doppler-resilient option using a smaller number of subcarriers;and, (v) 5-MHz bandwidth C-band transmissions for an order of magnitude capacity increase over existing 500-kHz channel schemes. To our knowledge, these are novel achievements for civil aviation, and our flight test results attained a technology readiness level (TRL) of 5. In this paper we briefly describe the project history, in which we spent approximately one year working with Boeing to participate in one of their Eco-Demonstrator flight trials, and obtained special temporary authorizations to transmit in both the L-band and C-band, from the FAA, the FCC, and the DoD. When COVID-19 dispersed worldwide, Boeing was no longer able to support us, so we revised our plans and teamed with the South Carolina Civil Air Patrol (SC CAP) to conduct smaller-scale flight tests. This paper summarizes the radio designs and the novel features we employed, as well as analyses, computer simulations, and laboratory tests prior to terrestrial mobile testing, all of which culminated in our successful flight tests. We show example flight test results that serve as proof of concept for all the five aforementioned radio performance enhancements. Example results include signal-to-noise ratio and bit error ratio, diversity gains, and throughput gains through both higher-order modulation and wider bandwidth channels. We also report on some lessons learned, and some ideas for future advancement of our work. © 2023 IEEE.

Detecting COVID-19 spreading phases with time series analysis

Piecewise linear regression (PLR) method is applied to study cumulative cases of COVID-19 evolving everyday in England up to 6th February 2022 just before travel restrictions are removed and people started not to get tested anymore in the UK and factors e.g. the lockdowns behind the spread COVID-19 are also investigated. It is clear that different periods exhibit distinct patterns depending on variants and government-imposed restriction. Therefore, the effectiveness of lockdown measures is evaluated by comparing the rate of increase after a certain period (delay effect of measures) and that of time before as well as how new variants take over as a dominant variant. In addition, autoregression function is studied to show strong effect of cases in the past on today's cases since the disease is highly infectious. Most of work is carried out thorough python built-in libraries such as pandas for preprocessing data and matplotlib which allows us to gain more insight and better visualization into the real scenario. Visualization is conducted by Geoda showing the regional level of infections. © 2023 SPIE.

Impact of COVID-19 pandemic on major depressive disorder in acute psychiatric inpatients.

Introduction: The spread of the coronavirus disease 2019 (COVID-19) pandemic and the subsequent restrictions significantly affected mental health, especially major depressive disorder (MDD) whose incidence increased by 27.6% in 2020, after the COVID-19 outbreak. Few studies focused on the impact of the pandemic on the clinical characteristics of outpatients with MDD and even fewer on inpatients admitted for a major depressive episode (MDE). We aimed to compare the characteristics of MDD of two groups of patients admitted for an MDE before and after the pandemic outbreak and to investigate which variables are significantly related to post-lockdown hospitalizations. Methods: This retrospective study included 314 patients with MDD hospitalized from January 2018 to December 2021 for an MDE (DSM-5) before (n = 154) and after (n = 160) the Italian lockdown (9th of March 2020). We compared patients' sociodemographic and clinical characteristics. The characteristics significantly different between the two groups were included in a logistic regression to identify the factors more strictly associated with post-lockdown hospitalizations. Results: During post-lockdown hospitalization, we found a higher rate of severe MDE (33 patients, 21.4%, in the pre-lockdown and 55 patients, 34.4%, in the post), MDE with psychotic features (3 patients, 2.0%, in the pre-lockdown and 11 patients, 6.9%, in the post-lockdown), and suicidal ideation (42, 27.3%, in the pre-lockdown and 67, 41.9%, in the post-lockdown), with a lower proportion of patients followed by psychiatric services before admission (106 patients, 68.8%, in the pre-lockdown and 90 patients, 56.3%, in the post-lockdown) and a higher percentage of them in treatment with psychotherapy (18 patients, 11.7% in the pre-lockdown and 32, 20.0%, in the post-lockdown) and more frequent increase of the antidepressant dosage (16 patients, 10.4% in the pre-lockdown and 32 patients, 20.0% in the post-lockdown) and adoption of augmentation strategies (13 patients, 8.4%, in the pre-lockdown and 26 patients, 16.3%, in the post-lockdown) to treat the MDE. In the regression model, post-lockdown hospitalizations were significantly associated with suicidal ideation (OR = 1.86; p = 0.016) and psychotic features (OR = 4.41; p = 0.029) at admission, the increase in the antidepressant daily dose (OR = 2.45; p = 0.009), and the employment of an augmentation therapy (OR = 2.25; p = 0.029). Discussion: These results showed an association between the COVID-19 pandemic and the occurrence of MDE with more severe clinical features. This might be true also for future calamities, suggesting that in these emergency contexts, patients with MDD would require more attention, resources, and intense treatments with a specific focus on suicide prevention.

MORTALITY TRENDS IN CROATIA IN THE FIRST TWO DECADES OF THE 21st CENTURY

Negative demographic trends in Croatia (natural decrease, negative net migration and population aging) are increasingly influencing socio-economic development of the country. Already in early 21st century, the long term decrease of live births and the increase of deaths were recognized as destabilizing factors of population development in Croatia. After the Croatian accession to the EU, the concerns regarding future demographic development of the country raised even more due to intensive emigration to other EU countries, which coincided with the historically low birth rates and high death rates. The focus of this paper is on mortality trends in Croatia in the first two decades of the 21st century. In this period, mortality in Croatia was influenced by different socio-economic, demographic, and epidemiological factors. Given the lack of recent papers dealing with mortality in Croatia, the main aim of this paper is to provide an overview of the changes in selected mortality indicators and contribute to the discussion on recent mortality trends in Croatia. The results of this research indicate that Croatia experienced some positive changes regarding mortality (increase of life expectancy at birth and decrease of infant mortality rates in the first period, in particular), but, some of the trends are not favourable, particularly the changes in the causes of death. Although improvements were observed regarding the share of deaths caused by the diseases of the circulatory system, there was a notable increase in deaths caused by the endocrine, nutritional and metabolic diseases which can be attributed to the unhealthy lifestyle and various behavioural factors.

Mild Androgen Insensitivity Syndrome presenting in male with infertility and sexual difficulties

Androgen insensitivity syndrome has a wide spectrum of presentations. It results from a mutation in androgen receptor (AR) gene. It ranges from mild androgen insensitivity syndrome (MAIS) which is the mildest form to complete androgen insensitivity syndrome (CAIS). In case of MAIS, the abnormality that can be observed appears to be male infertility and sexual difficulties including premature ejaculation and erectile dysfunction. In this case report, we discuss a case of MAIS in a 37-year-old male who presented with infertility, premature ejaculation, and secondary erectile dysfunction.Copyright © 2023, Ibn Sina Trust. All rights reserved.

Fertility and Reproductive Attitudes of the Population Before and After the Epidemiological Situation Worse

Introduction. The preservation and growth of the population is a key task of the Russian Federation Demographic Policy Concept until 2025. Nevertheless, in recent years, the achievement of this task has been difficult due to escalation of socio-economic and demographic problems. The purpose of the article is to determine and compare birth rates and reproductive attitudes of the population in various periods after the beginning of the 2000s, which differ in the socio-economic context and the list of demographic policy measures, including under the latest circumstances - the worsening epidemiological situation. Materials and Methods. The study is based on a statistical analysis of time series data indicators for conditional generations that reflect the demographic situation of fertility in Russia and the Komi Republic - crude and total fertility rates, natural population growth (decline), the number of women in reproductive age (15-49 years) in total structure of the female population, the number of women aged 15-24 in the structure of the female population of reproductive ages. Also, the methodological basis of the presented work is based on the results of three sociological studies, conducted by a team of scientists of The Institute for Social Economic and Energy problems of the North of the North Federal Research Center Komi Science Centre UB RAS in 2008, 2013 and 2020 among the population of the Komi Republic. Results. It is revealed that the most successful period of demographic development in Russia was 2013-2016 and in the Komi Republic in 2011-2016, which consists in achieving natural population growth. Further, there was a decrease in the birth rate. It is determined that the situation in the field of population reproduction has worsened in the context of the COVID-19 pandemic in Russia and the Komi Republic. The study reveals that reproductive attitudes in all generations are the best in 2013. The significant success in this period is the growth of reproductive attitudes even among young cohorts. Further in 2020, the expected number of children decreased in all age cohorts. In 2020, the pattern remains - the lowest reproductive orientations are in the two youngest age cohorts of 1996-2000 and 2001-2005 birth. Discussion and Conclusion. The main result of the work was the confirmation on the example of the northern region of Russia the thesis that the growth of the standard of living is accompanied by an increase in the reproductive attitudes of the population and the birth rate, and vice versa. From a theoretical point of view, the usefulness of the article lies in the description of the processes of fertility and the dynamics of the reproductive attitudes of the population, taking into account the changing socio-economic and epidemiological conditions. From a practical point of view, the information obtained can be useful as an assessment of future fertility prospects and confirmation of the high role of the socioeconomic well-being of the population in addressing the issue of increasing the level of children in the families.

Exploring Consumers Risk Mitigation Strategies in E-Commerce: A Qualitative Study of High-Risk Transactions

The recent Covid-19 pandemic has led to a sharp increase in online shopping. While the promises of shopping on e-commerce platforms are vast, there are simultaneously novel and exacerbated risks compared to traditional brick-and-mortar retail purchases. Existing research outlines numerous risk dimensions associated with online shopping. In addition, scholars examine the underlying reasons for consumers' risk perceptions, such as the inability of physical quality checks. However, there is a lack of research investigating how consumers attempt to navigate and mitigate risk perceptions when confronted with a high-risk online transaction. To address this research gap, we conducted 18 semi-structured interviews with consumers who had recently performed an online transaction associated with high-risk perceptions. Our study contributes to the existing literature by identifying an affective and cognitive risk mitigation strategy and respective underlying mechanisms. Notably, we find that online social networks play a central role in shaping consumers' risk perceptions. © 2023 IEEE Computer Society. All rights reserved.

The accounting treatment of expected credit losses by South African banks during COVID-19

Orientation: The coronavirus disease 2019 (COVID-19) pandemic negatively affected borrowers' ability to repay debt, which is expected to influence banks' calculation of their expected credit loss (ECL) allowance. Comprehensive disclosure regarding the application of managerial judgement in calculating ECLs would produce decision-useful financial information. Research purpose: This study explored the effects of the COVID-19 pandemic on the measurement and disclosure of ECL allowances by South African listed banks. Motivation for the study: It is unknown whether decision-useful financial information regarding South African banks' ECLs was produced during the pandemic, mirroring developed countries. Research approach/design and method: Content analysis of quantitative and qualitative data from annual financial statements was employed for a sample of listed banks. Main findings: Banks employed a variety of relief measures to accommodate borrowers, but these relief measures did not automatically trigger a significant increase in credit risk. More loans were subject to lifetime ECLs, causing the ECL allowance to increase substantially during the first year of the pandemic. Forward-looking information as well as postmodel adjustments were employed to measure the ECL allowance. Practical/managerial implications: The ECL allowances of South African listed banks increased during the pandemic. Disclosure in the annual financial statements and identifying ECLs as a key audit matter provided evidence of adequate consideration of the credit risk and forward-looking information influencing ECLs by banks and their auditors. Improved disclosure regarding postmodel adjustments is required. Contribution/value-add: During the COVID-19 pandemic, decision-useful financial information regarding the calculation of banks' ECL allowances was available for South African banks, mirroring developed countries.

Effect of Vaccination on Risk of Exposure to Airborne Infectious Disease During the Boarding Process in a Commercial Aircraft Using Agent-Based Simulation

As increasing proportions of the world's population have received at least one dose of the vaccine against COVID-19, everyday activities start to be resumed, including travels. The present study investigates the impact of immunization on the risk of exposure to an infectious disease such as COVID-19, during the boarding process in a commercial airplane. An agent-based simulation model considers different vaccine types and vaccination rates among passengers. The results show significant decrease in the median exposure risk, when the vaccination rate increases from 0% to 100%, but also that people in seats adjacent to an infectious passenger are in much higher risk, for a similar vaccination coverage. Such results provide quantitative evidence of the importance of mass immunization, and also that, when full vaccination is not guaranteed for 100% of passengers, it may be recommendable to avoid full occupancy of the aircraft, by implementing physical distancing when assigning seats. © 2022 IEEE.

Facial herpes zoster associated with disease reactivation in a patient with multiple sclerosis under dimethyl fumarate treatment

Background: Dimethyl fumarate (DMF) is an approved treatment for multiple sclerosis (MS). Due to its efficacy and safety profile, DMF is the most prescribed oral medication for relapsing remitting (RR) MS. Given the long-term course of treatment with DMF in MS, continuous surveillance of opportunistic infections is fundamental. Case presentation: We report the occurrence of facial herpes zoster (HZ) associated with MS disease reactivation in a person with RRMS after 6 years of DMF therapy. Case report: A 44-year-old woman with RRMS developed right temple pain and blisters over the right cheek, suggestive of facial HZ. A normal lymphocyte count with however relatively lower proportions of CD8+ T cells and higher percentages of natural killer cells were detected in blood. The patient failed oral treatment and required hospitalization for intravenous acyclovir. She eventually developed symptoms of an MS exacerbation featured by lower extremities weakness and urinary retention. Conclusion(s): Our case highlights the importance of counseling patients on the possibility of HZ reactivation even in the setting of a normal lymphocyte count, the risk of MS exacerbation possibly associated with HZ occurrence and the importance of timely vaccination.Copyright © 2022

The volume of freight transport in V4 countries relative to GDP

In the contribution, we deal with the development of GDP on the volume of transported goods in the V4 countries with regard to the post-Covid and pre-Covid periods. As part of the research, we examined the development of the period from 2011 to 2020, for which annual data were available. We assume that despite the critical years with regard to COVID-19, except for a minor period of decline or stagnation, the volume of transport itself is relatively stable. As part of the examination of the selected countries, it is significant that some countries from the V4 experienced a sharp increase in transport at the end of the given period, which ultimately had an impact on the GDP of the given country. © 2022 IEEE.

Environmental Noise Annoyance Trends in Selected Locations in Bratislava

The rapid development in traffic density and the economic transformation since 1989 has brought new problems concerning road traffic noise in Slovakia. The aim is to follow the time trends of noise annoyance in monitored localities in Bratislava at time intervals of 10, 20, and 30 years. We used the validated methodology for subjective assessment of noise annoyance in young and healthy individuals, as well as a method of objectification by direct measurement of sound levels. Respondents (n=3,675) were university students, living in the exposed and control dormitories representing a homogenous sample. The sharp increase in traffic noise burden in the exposed area was found at the first 10-year interval (1989-1999) (LAeq=67.5 dB). A slight decrease occurred in 2019 up to LAeq=63.9 dB and during lockdown due to COVID-19 pandemic it dropped to LAeq =62.5 dB. A sharp increase in road traffic noise annoyance was observed in the first 10-year interval (ORMH=2.56 (95 % CI=1.93-3.42) vs 6.01 (95% CI=4.97-7.95) with a slightly decreasing trend in 2020-2021. An increase in noise annoyance from entertainment facilities was observed as well. Despite a slightly declining trend, road traffic noise annoyance is still an important issue and there is a need for preventive measures to reduce such exposure in residential areas. © 2022 Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering. All rights reserved.

Literature review of data analytics utilization in Supply Chain Management

With an exponential increase in transition of various business to technical platforms there has been a huge data transfer between various platforms occurring every second. In 2020, there was a significant increase in the number of businesses shifting to online platforms during COVID, which not only increased the data traffic but also led both academic and IT industry to think of various techniques to improve data quality and data transformations in order to achieve optimal solutions from their captured data. The current review paper provides insight about how data analytics has been used by various phases within Supply chain management and also addresses the usage of data analytics in creation of various SCM models. The paper also addresses a number of research gaps while creating these SCM models, which leads to future research directions. © 2023 IEEE.

Survey of the European fabric fairs for autumn/winter 2023/24

The European fabric fairs for the autumn/winter 2023/24 season were held in a hesitant spirit, reflecting economic uncertainties affecting the whole of the textile and clothing industry. The industry has faced persistent disruptions to supply chains caused by lockdowns, which have continued to be imposed in major textile and clothing producing countries in an attempt to stem the spread of COVID-19. Furthermore, the war in Ukraine has introduced additional challenges—including difficulties in procuring raw materials and sharp increases in fuel and energy costs. At the same time, calls for the European textile and clothing industry to take action to reduce the damaging impact of its operations on the environment have intensified. It was evident at the fairs that many exhibitors had acknowledged these calls in the development of their product ranges for the autumn/winter 2023/24 season. Many had turned to eliminating dyes which contain harmful synthetic chemicals from their ranges and some had collaborated with leading innovators in the development of dyes which contain natural pigments, plant-based materials and, in some cases, fermented foodstuffs. For several exhibitors, it was important to replace finishing treatments which contain toxic chemicals with finishing treatments containing natural substances while for others the key considerations were traceability and transparency in the design and development of their ranges. The key colours for the autumn/winter 2023/24 season are rich and earthy, although there are some exceptions to this trend. Notably, grey is prominent—and silver is the principal metallic colour of the season. Print and pattern are prominent in collections for the season and, importantly, eccentric and fantastical graphic designs dominate. Designs which feature and surrealist imagery are prevalent while designs which are influenced by folklore and classical antiquity are popular. Also popular are designs which feature photographic imagery of landscapes and urban scenery, and designs which feature hand drawn illustrations, references to pop art, and collage. © Textiles Intelligence Limited 2022.

Characterizing the Differences in Descriptions of Violence on Reddit During the COVID-19 Pandemic.

Concerns have been raised over the experiences of violence such as domestic violence (DV) and intimate partner violence (IPV) during the COVID-19 pandemic. Social media such as Reddit represent an alternative outlet for reporting experiences of violence where healthcare access has been limited. This study analyzed seven violence-related subreddits to investigate the trends of different violence patterns from January 2018 to February 2022 to enhance the health-service providers' existing service or provide some new perspective for existing violence research. Specifically, we collected violence-related texts from Reddit using keyword searching and identified six major types with supervised machine learning classifiers: DV, IPV, physical violence, sexual violence, emotional violence, and nonspecific violence or others. The increase rate (IR) of each violence type was calculated and temporally compared in five phases of the pandemic. The phases include one pre-pandemic phase (Phase 0, the date before February 26, 2020) and four pandemic phases (Phases 1-4) with separation dates of June 17, 2020, September 7, 2020, and June 4, 2021. We found that the number of IPV-related posts increased most in the earliest phase; however, that for COVID-citing IPV was highest in the mid-pandemic phase. IRs for DV, IPV, and emotional violence also showed increases across all pandemic phases, with IRs of 26.9%, 58.8%, and 28.8%, respectively, from the pre-pandemic to the first pandemic phase. In the other three pandemic phases, all the IRs for these three types of violence were positive, though lower than the IRs in the first pandemic phase. The findings highlight the importance of identifying and providing help to those who suffer from such violent experiences and support the role of social media site monitoring as a means of informative surveillance for help-providing authorities and violence research groups.

Evolution of Helicobacter pylori Resistance to Antibiotics: A Topic of Increasing Concern.

Antibiotic resistance among Helicobacter pylori strains is the major cause of eradication failure. Resistance prevalence is dynamic and can greatly vary among countries over the years. We revealed H. pylori resistance trends for five antibiotics in 14 countries through articles predominantly published in 2018-2022, since the latest data can best show the most recent trends in resistance evolution. Amoxicillin resistance generally exhibited no evolution, yet it increased in Bulgaria, Iran, China, and Vietnam. Metronidazole resistance exhibited different trends, including an increase, a decrease and no evolution in six, three, and five studies, respectively. Clarithromycin resistance increased in Australia, Belgium, Bulgaria, Italy, Iran, and Taiwan, but remained stable in France, Spain, Russia, China, Chile, and Colombia. Tetracycline resistance was low and stable except in Iran. Levofloxacin resistance increased in four European and six other countries/regions, without significant increases in France, Spain, and Chile. In Chile, triple resistance also increased. In countries such as France and Spain, resistance to most antibiotics was stabilized, while in Bulgaria, Belgium, Iran and Taiwan, resistance to three or more agents was reported. Use of non-recommended regimens, national antibiotic consumption, patient's compliance, host factors, strain virulence, migrations, and azithromycin overuse during the COVID-19 pandemic can influence resistance evolution. New drugs, eradication regimens and diagnostic methods, such as next-generation sequencing can improve H. pylori infection control.

Intensive Neurofeedback Protocol: An Alpha Training to Improve Sleep Quality and Stress Modulation in Health Care Professionals During the Covid-19 Pandemic. A Pilot Study.

Objective: health care workers (HCWs) represent a vulnerable group in the COVID-19 pandemic, given the exposure to greater risk and higher levels of work-related stress. Neurofeedback (NF) has shown to be effective in the treatment of stress-related symptoms. We aimed to assess the effectiveness of an alpha-increase NF protocol for the treatment of acute stress symptoms in HCWs exposed to the COVID-19 pandemic. Method: eighteen medical doctors on duty during the COVID-19 health emergency underwent an intensive NF alpha-increase protocol. The mean alpha wave values were recorded at the beginning (T0) and at the last day of stimulation (T1). Rapid Stress Assessment: Italian version; Copenhagen Burnout Inventory (CBI); Pittsburgh Sleep Quality Index (PSQI), and Brief-COPE were administered as psychometric assessment. Results: a significant increase in alpha wave values and a significant reduction of the PSQI scores from T0 to T1 were found. Conclusions: NF alpha-increase protocol showed promising results in terms of stress modulation, sleep quality improvement, and safety in a pilot sample of HCWs.

Inward-looking policies, finite change, and employment: The capital reallocation effect

It is well recognized that there emerged a trend of inward-looking trade policies even before the COVID pandemic crippled the world. These were reflected in both BREXIT and US-China trade conflicts. As countries become inward-oriented, usually local prices start rising. With this backdrop, this paper explores how rising local prices are likely to affect employment in the short and long runs when we accommodate for the finite change in a general equilibrium structure whereby sectors not only contract but might also close down altogether due to the capital reallocation effect following a price incentive. © 2022 International Association for Economic Theory.